Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Reaction of trimethylaluminum with crown ethers. II. The synthesis and crystal structure of (Dibenzo-18-crown-6)tris(trimethylaluminum) and of (18-crown-6)tetrakis(trimethylaluminum) (1983)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 1 (1983), S. 61-69 
    Details
    ISSN: 1573-1111
    Keywords: Crown ethers ; trimethylaluminum ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Both title compounds were prepared by adding AlMe3 to a suspension of the appropriate crown ether in toluene, followed by reaction in a sealed tube. Both products were obtained in the form of extremely air-sensitive, colorless crystals. [AlMe3]3[dibenzo-18-crown-6] crystallizes in space group PĪ, witha=8.898(4),b=11.848(5),c=19.060(6) Å, α=74.86(3), β=80.73(4), and γ=67.02(4)°. Refinement led to a final conventional weightedR value of 0.052 for 1800 reflections. [AlMe3]4[18-crown-6] belongs to space group Pbcn, witha=18.753(3),b=12.570(6), andc=15.095(6) Å. Refinement was taken toR w =0.064 for 1320 reflections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658016
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Stabilization of H2O ⁗ BF3 by hydrogen bonding to 18-crown-6 (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 153-158 
    Details
    ISSN: 1573-1111
    Keywords: Hydrogen bonding ; 18-crown-6 ; boron trifluoride ; water ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decomposition of H2O ⁗ BF3 in both the solid and solution states is rapid at room temperature, but 18-crown-6 ⁗ H2O ⁗ BF3,1, is stable to its melting point, 72°C.1 crystallizes in the monoclinic space groupC2/c witha = 27.273(9),b = 8.432(5),c = 22.936(9) Å, β = 128.33(4)°, andD c = 1.27 g cm−3 forZ = 8. Least-squares refinement based on 1409 observed reflections led to a finalR = 0.083. The BF3 is covalently bonded to the oxygen atom of the water molecule which in turn is hydrogen bonded to the 18-crown-6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041648
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Calixarenes as second-sphere ligands for transition metal ions. Synthesis and crystal structure of [(H2O)5 Ni(NC5H5)]2(Na)[calix[4]arene sulfonate] · 3.5 H2O and [(H2O)4Cu(NC5H5)2]-(H3O)3 [calix[4]arene sulfonate] · 10 H2O (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 14 (1992), S. 37-46 
    Details
    ISSN: 1573-1111
    Keywords: Calix[4]arene ; crystal structure ; second-sphere coordination ; nickel(II) ; copper(II) ; pyridine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The title compounds crystallize such that bilayers of calixarenes are separated by hydrophilic layers. In each case the transition metal has, in addition to a primary sphere of ligands, a second-sphere coordination by a calixarene. [(H2O)5Ni(NC5H5)]2(Na)[calix[4]arene sulfonate]·3.5 H2O,1, crystallizes in the triclinic space groupP $$\bar 1$$ witha = 12.487(4),b = 14.281(2),c = 15.055(5) Å, α = 85.66(2), β = 80.07(2), γ = 80.48(2)°, andD c = 1.64 g cm−3 forZ = 2. Refinement based on 2441 observed reflections led to a finalR value of 0.066. There are two different environments for the nickel-containing cations: one is positioned within the hydrophilic layer with the pyridine ligand intercalated into the hydrophobic calixarene bilayer and the other is also positioned within the hydrophilic layer, but the pyridine ligand is inserted into the hydrophobic cavity of the calix[4]arene. [(H2O)4Cu(NC5HS)2](H3O)3[calix[4]arene sulfonate]·10 H2O,2, crystallizes in the triclinic space groupP $$\bar 1$$ witha = 15.438(4),b = 15.727(6),c = 12.121(9) Å, α = 112.74(4), β = 102.02(4), γ = 85.34(4)°, andD c = 1.57 g cm−3 forZ = 2. Refinement based on 3925 observed reflections led to a finalR value of 0.107. The structure is similar to that of 1 except that the one copper-containing cation spans the hydrophilic layer and is intercalated into the bilayer of calixarenes on one side and positioned into the calixarene cavity on the other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041364
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Tribracchial lariat ethers: Syntheses, binding, and formation of an intramolecular macroring-sidearm complex in the absence of any cation (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 12 (1992), S. 187-197 
    Details
    ISSN: 1573-1111
    Keywords: Cation binding ; crown ether ; crystal structure ; lariat ether ; synthesis ; triaza-18-crown-6
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Details of a new synthetic approach to 4,10,16-triaza-18-crown-6 (‘triaza-18-crown-6’) are reported, along with the preparation and binding properties of the following derivatives having the indicated sidearms: CH2C≡CH, CH2CH2OH, CH2CH2OCH3, COCH2OCH3,CH2COOCH2CH3, CH2C6H5, and CH2C6H4−2−NO2. A key intermediate in the synthesis of triaza-18-crown-6 is 4-N-toluenesulfonyl-1,7,13-trioxa-4,10,16-triazacyclooctadecane-9,17-dione. This compound is found by solid state structure analysis to fold to form an intramolecular, doubly-hydrogen bonded complex in which the two N-H protons interact with the two tosyl group oxygens. Details of the structure are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053861
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The interaction of alkali metal cations with aromatic molecules in complexes of the type M[AlMe3X]·aromatic, M[Al2Me6X]·aromatic, and related (1985)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 3 (1985), S. 13-20 
    Details
    ISSN: 1573-1111
    Keywords: alkali metal ions ; metal-aromatic interactions ; crystal structure ; aluminum alkyls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structures of 13 compounds of the form M[Al2Me6X]·aromatic and related have been examined in order to learn about the M+...aromatic approach. Four types of interactions have been discerned: (1) metal...aromatic, (2) metal...aromatic...metal, (3) aromatic...metal...aromatic, and (4) no metal...aromatic contact. It was found that the closest K+...C(aromatic) and Cs+...C(aromatic) separations are essentially equal after a correction for the difference in metal radii. The strength of the K+...aromatic attraction was found to be sufficient to move the K+ ion 0.3 Å out of the plane of the crown ether in two complexes of dibenzo-18-crown-6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658856
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Behavior of M[Al2Me6N3] (M=K, Rb, Cs) with aromatic solvents and the crystal structures of Cs[Al2Me6N3]·2p-xylene and [K·dibenzo-18-crown-6] [Al2Me6N3]· 1.5(1-methylnaphthalene) (1985)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 3 (1985), S. 113-123 
    Details
    ISSN: 1573-1111
    Keywords: Aromatic...cation interactions ; crown ethers ; liquid clathate ; trimethylaluminum ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The title compounds were synthesized by the addition of AlMe3 to the corresponding azide suspended in an aromatic solvent. Both products were obtained as air-sensitive colorless crystals. Cs[Al2Me6N3]·2p-xylene crystallizes in the monoclinic space groupC2/m witha=19.143(6),b=16.227(6),c=10.392(5) Å, β=114.06(2)o, and ρcalc = 1.20 g cm−3 forZ=4. Refinement led to a conventionalR value of 0.037 for 2179 observed reflections. The cesium atom resides on a mirror plane, and the anion is disordered about a twofold axis. Thep-xylene molecules sandwich the cesium ion. [K·dibenzo-18-crown-6] [AlMe6N3]·1.5(1-methylnaphthalene) crystallizes in the monoclinic space groupP21/c witha=14.176(5),b=13.021(5),c=25.324(8) Å, β=98.23(4)0, and ρcalc = 1.08 g cm−3 forZ=4. The finalR value was 0.132 for 1402 observed reflections. One of the 1-methylnaphthalene molecules is disordered about a center of inversion and interacts with the potassium ion. The other solvent molecule is found roughly in layers in the lattice and also exhibits disorder of the methyl substituent. For both title compounds the AlMe3 groups of the anion exhibit a staggered (C s) conformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687984
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Thiocalix[4] arenes. I. Synthesis and structure of ethylthiocalix[4]arene methyl ether and the related structure of bromocalix[4]arene methyl ether (1990)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 9 (1990), S. 195-206 
    Details
    ISSN: 1573-1111
    Keywords: Calix[4]arene ; thiocalixarene ; bromocalixarene ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Bromocalix[4]arene methyl ether serves as a precursor in the synthesis of the title thiocalixarene via the reagent CuSEt. Ethylthiocalix[4]arene methyl ether crystallizes in the monoclinic space groupP21/c witha = 20.577(9),b, = 10.722(5),c = 20.315(9) Å, β = 120.46(4)°, andD c = 1.24 g cm−3 forZ = 4. Refinement based on 1441 observed reflections led toR = 0.080. The configuration of the calixarene lies between the partial cone and the 1,3-altemate conformations. Bromocalix[4]arene methyl ether crystallizes in the triclinic space groupPI witha = 12.283(7),b = 17.658(9),c = 18.118(6) Å, α = 90.25(6), β = 105.95(4), γ = 105.11(6)°, andD c = 1.68 g cm−3 forZ = 4. Refinement based on 3028 observed reflections led toR = 0.083. The unit cell also contains four CHCl3 molecules which exist pairwise enclathrated by six calixarenes. The partial cone conformation of the bromocalixarene is identical to that of ethylthiocalix[4]arene methyl ether.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053117
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Reaction of early transition metal complexes with macrocycles. II. Synthesis and structure of TiCl3(H2O) · 18-crown-6, a compound with a unique bidentate bonding mode for the 18-crown-6 molecule (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 241-246 
    Details
    ISSN: 1573-1111
    Keywords: Crown ether ; early transition metal ; hydrogen bonding ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 18-crown-6 reacts with TiCl3 in CH2Cl2 to form a complex in which the crown ether functions as a tridentate ligand. Addition of moist hexane affords a molecular complex in which the crown ether functions as a bidentate ligand. A water molecule is bonded directly to the titanium atom and is further hydrogen bonded to three of the oxygen atoms of the crown. The deep blue crystals of the CH2Cl2 adduct belong to the monoclinic space groupP21/n witha=13.481(8),b=8.021(5),c=21.425(9) Å, β=97.32(5)°, andρ calc = 1.51 g cm−3 forZ=4. Refinement led to a conventionalR value of 0.040 based on 873 observed reflections. The Ti−O bond distances for the crown oxygen atoms are 2.123(8) and 2.154(9) Å, while the oxygen atom of the water molecule is bonded at 2.072(8) Å. The octahedral coordination sphere of the titanium atom is completed by the three chlorine atoms at distances of 2.340(5), 2.352(4), and 2.373(4) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657997
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Preparation and structure of (calix[8]arene methyl ether) · 2CDCl3 (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 247-253 
    Details
    ISSN: 1573-1111
    Keywords: calix[8]arene ; crystal structure ; CDCl3 guest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The methyl ether of calix[8]arene crystallizes from CDCl3 with two molecules of the solvent per molecule of host. An X-ray structural investigation has shown that the CDCl3 guests exist within the calixarene framework. The complex resides on a crystallographic center of inversion, and the cavity is roughly circular in projection as measured by the distance between centroids of aromatic rings related by the center: 14.5, 13.9, 10.1, and 11.2 Å. Six of the oxygen atoms are found on the inside and two on the outside. Crystals belong to the triclinic space group $$P\bar 1$$ witha=11.741(9),b=11.810(9),c=12.484(8) Å, α=94.74(8), β=104.41(8), γ=111.30(9)°, andD c =1.31 g cm−3 forZ=1. Refinement led to a finalR value of 0.086 for 949 observed reflections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657998
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Reaction of trimethylaluminum with calixarenes. I. Synthesis and structure of [Calix[8]arene methyl ether] [AlMe3]6·2 toluene and of [p-tert-butylcalix[8]arene methyl ether] [AlMe3]6·4 benzene (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 581-590 
    Details
    ISSN: 1573-1111
    Keywords: Calix[8]arene ; crystal structure ; AlMe3 ; aromatic adduct
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reaction of the methyl ether of calix[8]arene with AlMe3 yields [calix[8]arene methyl ether] [AlMe3]6·2 toluene,1, while that ofp-tert-butylcalix[8]arene gives [p-tert-butylcalix[8]arene methyl ether] [AlMe3]6·4 benzene,2. Both compounds1 and2 fail to react with alkali metal salts, MX. In1, the absence of a butylpara-substituent affords greater flexibility than is the case for thetert-butyl compound2. Thus, all six of the AlMe3 groups are located on the outside of the macrocyclic ring (in projection) in1, but two AlMe3 units are found on the inside in2. Colorless, air-sensitive crystals of1 belong to the triclinic space group $$P\bar 1$$ witha=13.690(8),b=14.317(4),c=14.738(6) Å, α=76.11(3), β=62.36(4), γ=82.41(4)o, andD c =1.06 g cm−3 forZ=1. Refinement led toR=0.101 for 1154 observed reflections.2 crystallizes in $$P\bar 1$$ with α=12.400(6),b=16.229(8),c=19.251(5) Å, α=96.17(3), β=107.25(3), γ=101.54(3)o, andD c =1.01 g cm−3 forZ=1. Refinement of2 gaveR=0.128 for 4351 observed reflections. The macrocyclic array in both1 and2 lies about a crystallographic center of inversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662997
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...